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<div id="sidebar"> <a href="#" class="visible-phone"><i class="icon icon-list"></i>Module</a>
    <ul>
        <li <?php echo (!isset($_GET['mod']))?'class="active"':'' ?> ><a href="cp.php"><i class="icon icon-home"></i> <span>Trang chính</span></a> </li>
        <li class="submenu "><a href="widgets.html"><i class="icon icon-inbox"></i> <span>Phân lớp</span></a>
            <ul>
                <li><a href="">Danh sách lớp chưa phân <span class="label label-important">4</span></a></li>
                <li><a href="">Danh sách lớp</a></li>
                <li><a href="">Thêm lớp mới</a></li>
            </ul>
        </li>
        <li><a href="charts.html"><i class="icon icon-signal"></i> <span>Charts &amp; graphs</span></a> </li>
        <li><a href="tables.html"><i class="icon icon-th"></i> <span>Tables</span></a></li>
        <li><a href="grid.html"><i class="icon icon-fullscreen"></i> <span>Full width</span></a></li>
        <li class="submenu"> <a href="#"><i class="icon icon-list"></i> <span>Forms</span> <span class="label label-important">3</span></a>
            <ul>
                <li><a href="form-common.html">Basic Form</a></li>
                <li><a href="form-validation.html">Form with Validation</a></li>
                <li><a href="form-wizard.html">Form with Wizard</a></li>
            </ul>
        </li>
        <li><a href="buttons.html"><i class="icon icon-tint"></i> <span>Buttons &amp; icons</span></a></li>
        <li><a href="interface.html"><i class="icon icon-pencil"></i> <span>Eelements</span></a></li>
        <li class="submenu"> <a href="#"><i class="icon icon-file"></i> <span>Addons</span> <span class="label label-important">5</span></a>
            <ul>
                <li><a href="index2.html">Dashboard2</a></li>
                <li><a href="gallery.html">Gallery</a></li>
                <li><a href="calendar.html">Calendar</a></li>
                <li><a href="invoice.html">Invoice</a></li>
                <li><a href="chat.html">Chat option</a></li>
            </ul>
        </li>
        <li <?php echo (isset($_GET['mod']) && $_GET['mod']=="mon")?'class="active"':'' ?> ><a href="cp.php?mod=mon"><i class="icon icon-book"></i> <span>Môn</span></a> </li>
        <li <?php echo (isset($_GET['mod']) && $_GET['mod']=="khuvuc")?'class="active"':'' ?> ><a href="cp.php?mod=khuvuc"><i class="icon icon-globe"></i> <span>Khu vực</span></a> </li>
        <li <?php echo (isset($_GET['mod']) && $_GET['mod']=="thoigian")?'class="active"':'' ?> ><a href="cp.php?mod=thoigian"><i class="icon icon-time"></i> <span>Thời gian</span></a> </li>
        <li <?php echo (isset($_GET['mod']) && $_GET['mod']=="user")?'class="submenu active"':'class="submenu"' ?>> <a href="#"><i class="icon-group"></i> <span>Người dùng</span></a>
            <ul>
                <li><a href="cp.php?mod=user&task=list">Danh sách người dùng</a></li>
                <li><a href="cp.php?mod=user&task=add-admin">Thêm người quản trị</a></li>
            </ul>
        </li>
        <li><a href="cp.php?mod=category&task=view"><i class="icon icon-tint"></i> <span>Tin tức</span></a></li>
    </ul>
</div>

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<div id="content">
    <div class="container-fluid">